[FLINK-22408]Flink Table Parsr Hive Drop Partitions Syntax unparse is Error

[githubMJ]

What is the purpose of the change

Flink Table Parsr Hive Drop Partitions Syntax unparse is Error

Brief change log

Flink Table unpase is error：
Synopsis:
SQL：
alter table tbl drop partition (p1='a',p2=1), partition(p1='b',p2=2);
hive muit partition unparse toSqlString is :

ALTER TABLE `TBL`\n" +
      "DROP\n" +
      "PARTITION (`P1` = 'a', `P2` = 1)\n" +
      "PARTITION (`P1` = 'b', `P2` = 2)

Missing comma in Partition SqlNodeList
Hive syntax：
ALTER TABLE table_name DROP [IF EXISTS] PARTITION (partition_spec) [, PARTITION (partition_spec)];

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

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Last check on commit a739239 (Fri May 28 11:04:59 UTC 2021)

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CI report:

• a739239 Azure: SUCCESS Azure: FAILURE

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[githubMJ]

close PR, fix this issue in release-1.12 branch